Study of magnetization and critical temperature for nanomagnetic particles

International Conference and Exhibition on Mesoscopic & Condensed Matter Physics

June 22-24, 2015 Boston, USA

Abrham Feseha Wreta

Arba Minch University, Ethiopia

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

Magnetic nanostructures, such as dots and dot arrays, nanowires, multilayers and nano-junctions, are reviewed and compared with bulk magnets. By using the Gibbs free energy variational principle based on the Bogoliubov inequality the magnetic properties and critical behavior of metallic nanoparticles having concurrently atomic disorder, dilution and competing interactions, are studied within the framework of an Ising model. As a case of study we have considered the Fe0.5 Mn0.1 Al0.4 alloy characterized for exhibiting, under bulk conditions, low temperature reentrant spin glass (RSG) behavior and for which experimental and simulation results are available. Our results allow concluding that the variational model is successful in reproducing features of the dependence of the critical temperature with particle size and low temperature magnetization reduction consistent with a RSG behavior. In this work we compute the magnetization per site and the magnetic susceptibility, as a function of temperature, for different values of the coordination number.

Biography :

Email: abrhamfff@gmail.com